Three
Provide feedback on the ideas of others by voting with kudos and adding comments.
For more information about using ideas, read this thread.

FourTrack
your ideas and those you like. Once you've posted or kudoed and idea,
subscribe to be notified via email of the latest updates to the idea.
From within the idea, click "Idea Options" which appears above the idea title
and choose, "Subscribe to this idea".

Be sure to check back from time to time to see new ideas and status updates!